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6LD12

Sensibly equivalent to:
6AD8 6AK8 6T8 DH719 EABC80
See also:
Aspects of design 25: FM Ratio Detector (part 2) - 6LD12 Advert
    
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The 6LD12 has three separate electrode sections within the envelope. The triode and two diodes share a common cathode but one diode has a separate cathode.
The 6LD12 was specifically designed for use in the detector stage of early FM and FM/AM radios. The triode section providing the first audio amplification, one half of the double diode for AM detection and the single diode and one of the diode pair for FM demodulation, probably in a ratio detector circuit.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins, is 55 mm tall.
References: Data-sheet, 3002 & 1040. Type 6LD12 was first introduced in 1952. See also 1952 adverts.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(d3)
a(d2)
k(d2),s
h
h
a(d1)
k
g1
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.45
250
-3
1.0
50,000
1.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December04, 2016.
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